
1. The famous "Melting building" in Paris uses optical illusion techniques.

2. The Kunsthaus Graz is an art museum built in Austria.

3. Wonderworks at Pigeon Forge, US, is an upside down "amusement park for the mind".

4. A UFO shaped house at Pensacola, Florida, US.

5. Salvador Dali spent the last years of his life at the Torre Galatea in Figueras, Spain and it's now open to the public.

6. A shoe house in Pennsylvania.

7. The Hundertwasser building in Austria is a popular tourist attraction.

8. Quebec Olympic Stadium.

9. The Nationale-Nederlanden building in Prague is also known as the "Dancing building".

10. Selfridges Department Store at Birmingham, UK.

11. Kubuswoning (Cubic Houses) at the Netherlands.

12. The Basket Building in Newark, Ohio, US.

13. Casa Batllo was built in 1877 in Barcelona, Spain.

14. A stone house in Fafe, Portugal.

15.The Teapot dome gas station at Yakima Valley, Washington, US.

16. The Eden Project is a tourist attraction in the UK which features the world's largest greenhouse.

17. The Fuji television building in Tokyo.

18. Kansas City Library.

19. The UK's Container City.

20. The Gherkin building in London, UK.